jointhefediverse.net seems to be a commonly linked resource for directing people to join the Fediverse.
Curiously, it does not list Lemmy under the list of Reddit alternatives. Their GitHub README explains why.
Previous relevant discussion: https://lemmy.ml/post/78808
If you use “Most active”, it will shows up after lemm.ee and the other big instances. So not default, but would still be recommended to new joiners
Well to me that doesn’t fit the “it’s default” description.
While looking at that, I couldn’t see lemmy.world on that page. I found that join-lemmy.org now excludes instances with >30% user share in order to dampen centralisation. Which makes sense I guess.